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                [Usaco2005 nov]Grazing on the Run 边跑边吃草                </h1>
                <p>时间限制：5s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：64MB</p>			</div>
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                                <h3>题目描述</h3><p><div>John养了一只叫Joseph的奶牛。一次她去放牛，来到一个非常长的一片地，上面有N块地方长了茂盛的草。我们可</div>
<div>以认为草地是一个数轴上的一些点。Joseph看到这些草非常兴奋，它想把它们全部吃光。于是它开始左右行走，吃</div>
<div>草。John和Joseph开始的时候站在p位置。Joseph的移动速度是一个单位时间一个单位距离。不幸的是，草如果长</div>
<div>时间不吃，就会腐败。我们定义一堆草的腐败值是从Joseph开始吃草到吃到这堆草的总时间。Joseph可不想吃太腐</div>
<div>败的草，它请John帮它安排一个路线，使得它吃完所有的草后，总腐败值最小。John的数学很烂，她不知道该怎样</div>
<div>做，你能帮她么？</div></p><hr/><h3>输入格式</h3><p><div>* Line 1 : Two space-separated integers: N and L. N&lt;=1000</div>
<div>* Lines 2..N+1: Each line contains a single integer giving the position P of a clump (1 &lt;= P &lt;= 1,000,000).</div></p><hr/><h3>输出格式</h3><p><p><span style="font-size: medium">* Line 1: A single integer: the minimum total staleness Bessie can achieve while eating all the clumps. </span></p></p><hr/><h3>样例输入</h3><pre>4 10
1
9
11
19
INPUT DETAILS:
Four clumps: at 1, 9, 11, and 19. Bessie starts at location 10.</pre><hr/><h3>样例输出</h3><pre>44
OUTPUT DETAILS:
Bessie can follow this route:
* start at position 10 at time 0
* move to position 9, arriving at time 1
* move to position 11, arriving at time 3
* move to position 19, arriving at time 11
* move to position 1, arriving at time 29
giving her a total staleness of 1+3+11+29 = 44.  There are other routes
with the same total staleness, but no route with a smaller one.44</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>Gold</p>
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